I have a ‘98 Rexhall Aerbus Ford 460 7.5. Replaced starter, selonoids, fuel pump, filter, fuel pressure regulator, and battery. Still won’t start. Turns over but no fire. The tank isn’t back in place because I wanted to see if it would start first. All wires, fuel lines are hooked up properly. There was fuel in the fuel pressure regulator when I removed it. Checked relays and fuses and are good. Should it start although tank is not reattached? I’m at a loss of what to try next. I’ll check Schrader valve today. Then, I’ll replace spark plugs, rotor, and distributor cap also. Is there anything else that it might be that I need to try? Any recommendations and help is highly appreciated. I also have a new battery. Since the fuel pump is in the back, I can’t hear if it hums for a few secs. I’m doing this alone an no one to assist physically. That’s a different story. It will start with a shot of starter fluid.